Except for the fact that JB led the team on a 13 play, 75 yard touchdown drive into the 4thQ that included completions of 10 yards to Horne, 27 yards to Horne, 9 yards to Young, 12 yards to Johnson, and 4 yards to Horne......well, yea, ignoring those facts, you might be right.
Forget the positives
The choosing-sides aspect among fanbase of this QB competition has ended up as nitpicking. Player A isn't good enough at (X), but the counterpoint is he's better than (B) at that but worse at (Y) and so on.
So what happens is, examples such as yours are downplayed in favor of pointing out the flaws (and it's that way with both Jantz & Barnett).
In all 3 touchdown drives vs. KSU, the offense looked well-oiled. It was fun to watch.
We simply need more of those each game.
Part of it's QB consistency & effectiveness, as well as minimizing penalties and turnovers, good line play, effective rushing game, dependability of receivers, getting first downs, good punting/field position when needed, confidence with placekicker and game plan that plays to ISU's strengths and can best exploit opponent's shortcomings (each adapted to specific opponent when necessary).
That's a lot of Stuff.
If all of that comes together better under one QB than another one, you go with that player as the starter.
Edit: Red zone efficiency, too.